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Posted on Feb 23, 2009
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Aprilaire 440 won't stop running

I noticed that we have no hot water and there is a contant flow of water exiting from a PVC pipe coming from the humidifier into the sump pit. I tried adjusting the setting on the humidistat and even turned it to off and the water just keeps flowing. It did stop when I turned the saddle valve all the way off for a little while, but then I won't get any humidity and it is very dry. It is Feb. in Chicago and it's been around 20 degrees and going to be hitting 30. I had the humidity set at 25, and just changed it to 35. I do not want to shut it off, but I do not want the water, hot water heater and sump pump running constantly and I do not want to always be out of hot water.

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  • sauters88 Mar 29, 2009

    I have an Aprilaire whole house humidifier and even though I turned the humidifier totally off, the water from the humidifier just runs and runs. We shut off the water valve completely to solve the problem temporarily.

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Lou Barta

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  • Expert 189 Answers
  • Posted on Mar 08, 2009
Lou Barta
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Joined: Mar 08, 2009
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Disconnect the two low voltage wirings going into the solenoid valve. If the water does not stop running after a few minutes the valve is bad. When you check your local area to price a new valve. Also get a price for a new humidifier. You will be surprised to find that a whole new unit isn't that much more. Or should I say that you will find that the replacement parts are overpriced.
Good Luck
HVAC Teacher

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Related Questions:

0helpful
1answer

With the furnace running (air humidifier on) I peered though the air filter slot and could see the water cascading down the inside of the plenum face that the humidifier is mounted to. Is this normal?
Yes thats how it works If you think the flow is too fast turn down the flow , with the valve on the water line .
Read full answer
Nov 14, 2021 • Aprilaire Humidifiers
0helpful
2answers

Aprilaire 500 water won't stop running down to condensate pump
Hello, sounds like rhe solenoid valve is stuck open. This will keep water flowing through the humidifier even if the Furnace is off. The solenoid valve will have to be replaced.
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Dec 01, 2012 • Humidifiers
3helpful
1answer

The clear plastic drainage tube that runs from our Aprilaire furnace humidifier into the basement floor appears to be clogged with brown gunk. How can we clear this line.
One way of removing the gunk is to disconnect the tubing from the humidifier and use a flexible and thin rod that will fit in the tubing and try to dislodge it, or you can try using a shop vac and see if the suction pressure will remove it. If the tubing is really clogged then sometimes it's better to just replace the vinyl tubing with pvc pipe and drain it to the floor drain, I always prever pvc pipe over vinyl tubing when it comes to drain lines for humidifiers.
Read full answer
Jan 17, 2011 • Aprilaire 700 Humidifier
1helpful
1answer

There is no water reaching my AprilAire humidifier, indeed no water is flowing through the saddle valve attached to the hot water pipe of the hot water heater. Considering what would be involved in...
Yes a new valve seems in order. and yes having the valve on the cold side would create less build up in the filter pad so long as your water dose not come in at 37 degrees. but, I think you have it right.
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Dec 22, 2010 • Aprilaire 550 Humidifier
2helpful
1answer

I have an Aprilaire humidifier that's 8 years old. A few months ago, we noticed a vibration/hum when the humidifier is on. Here's the kicker, the vibration goes away immediately when hot or cold water is...
Please have the selonid valve replaced.The coil is shot.
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Mar 07, 2010 • Aprilaire 550 Humidifier
1helpful
1answer

Aprilair 760 Humidfier will not stop water flow to EV panel
If the water continues runs nonstop even when the heater is turned off, you might have either a bad solenoid valve or a bad humidistat. Simply disconnect one of the two low voltage wires going into the unit. If the water turns off then your problem is most likely your humidistat or the low voltage wiring. If the water continues to run even when the low voltage is disconnected you have a defective solenoid valve.
Good luck.......
Read full answer
Apr 09, 2009 • Aprilaire 700 Humidifier
1helpful
2answers

Aprilaire 700 leaks water from bottom of case
Install new water panels yearly. On the new panel make sure that the painted dot on the edge of the panel is on the top when you install it.
Always clean the distribution tray and the frame. Make sure the notch on the edge of the distribution tray faces away from the furnace. Make sure the humidifier was installed level. Keep the drain tube opening clear. Insure there is no blockages in the drain tube.
Good luck
HVAC Teacher
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Feb 10, 2009 • Aprilaire 700 Humidifier
0helpful
2answers

Routing waterline to pad
1/4" flexible copper pipe. Tap into your cold water line using the included saddle valve (pierces the pipe), attach the 1/4" flexible copper pipe to the saddle valve on the cold water pipe and the solenoid valve on humidifier unit using the included compression fittings. Tada!
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Dec 10, 2008 • Aprilaire 550 Humidifier
0helpful
1answer

No water flow to the humidifier
Turn that pin to the left and that will open the valve to allow water to flow through it. If it starts to leak the all you need to do is tighten the nut that were the water is coming out with a wrench, be carefull it wont take much to tighten.
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Dec 02, 2008 • Aprilaire 600 Humidifier
0helpful
2answers

Aprilaire 600 doesn't seem to be running at all
check list
1.check the clamp on the pipe where water line connects
is the hole clogged (water turned off)wont take long
2.Is water flowing all the way to resevoir after turnnig water on
loosen line at reservoir
3.jiggle float water should enter the reservoir inlet to float valevel
somestime cake up,clean float off
4.Remove pump cap clean impeller and standpipe
5.clean reservoir,and close everything up

Usually the hole in the pipe is clogged up in step 1 or the float is sticking if there is no evidence of water in the reservoir
Read full answer
Nov 20, 2007 • Aprilaire 600 Humidifier
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With the furnace running (air humidifier on) I peered though the air filter slot and could see the water cascading down the inside of the plenum face that the humidifier is mounted to. Is this normal?

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